[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Sebastian Kügler via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #38 from Sebastian Kügler  ---
Very good to know, thanks for testing!

As to your questions ...
* the shortcut issue is of course unrelated, as you note, so it would be good
if you could check if there's a bug reported for that
* You can just pull in updates through apt, it doesn't matter which iso you
installed from (as long as it's an iso which set up the right repos (basically
means, if you don't change it, you'll continue to get updates from master.
Don't be surprised if lots of package updates come in daily.
* The dev/stable version will have it as soon as 5.8 is out (I've looked into
backporting these fixes, but can't sensibly do that since it's a number of
patches across different repositories and we have no way of testing that enough
to go into a stable update, and we also have no further updates planned, so a
regression introduced can't get fixed.

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[zanetti357 via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #37 from zanetti357  ---
(In reply to Sebastian Kügler from comment #36)
> @zanetti: KDE Neon has up to date packages:
> http://files.kde.org/neon/images/neon-devedition-gitunstable/current/
> 
> Keep in mind that these images are not production quality, but a snapshot
> from our development tree. Use at your own risk, but do let us know if thing
> work for you. :)

Hi Sebastian, it works like charm with my external monitor, however, as you
said, it's an unstable version so it has some issues (I found that I can't
modify Global Shortcuts, for example, when I open it and it starts in the Audio
tab, I can't switch to the KWin tab).
Will this update as the unstable version is being developed or I have to
install the latest image every month if I want the latest features?
Does the devStable version have this "external monitor fix"?
Thanks for your help, really apreciated.

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Sebastian Kügler via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #36 from Sebastian Kügler  ---
@zanetti: KDE Neon has up to date packages:
http://files.kde.org/neon/images/neon-devedition-gitunstable/current/

Keep in mind that these images are not production quality, but a snapshot from
our development tree. Use at your own risk, but do let us know if thing work
for you. :)

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[zanetti357 via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

zanetti357  changed:

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 CC||zanetti_...@hotmail.com

--- Comment #35 from zanetti357  ---
(In reply to Sebastian Kügler from comment #34)
> A couple of causes for this bug have been fixed in the Plasma/5.8 branch.
> 
> If problems persists with the latest code, please file a separate report to
> keep the debugging history clean (this bug-report mixes different causes and
> effects).

Sorry Sebastian, would you please explain me how to install the latest
Plasma5.8? This problem is driving me crazy and I've just started using
Kubuntu.
Thanks in advance!

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Sebastian Kügler via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

Sebastian Kügler  changed:

   What|Removed |Added

 Status|CONFIRMED   |RESOLVED
 Resolution|--- |FIXED

--- Comment #34 from Sebastian Kügler  ---
A couple of causes for this bug have been fixed in the Plasma/5.8 branch.

If problems persists with the latest code, please file a separate report to
keep the debugging history clean (this bug-report mixes different causes and
effects).

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Sebastian Kügler via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #33 from Sebastian Kügler  ---
http://files.kde.org/neon/images/neon-devedition-gitunstable/current/? should
contain those fixes.

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Paulo Fidalgo via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #32 from Paulo Fidalgo  ---
If there's an updated live version, I can test with my setup a Macbook pro
retina with an external monitor via mini-displayPort or HDMI.

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Sebastian Kügler via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

Sebastian Kügler  changed:

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 CC||se...@kde.org

--- Comment #31 from Sebastian Kügler  ---
I've found a problem in the code enabling outputs. Information about crtcs was
outdated, which meant outputs failed to enable in certain cases, and were
subsequently disabled. We're now querying the crtcs right before enabling an
output, which seems to be much more reliable.
I think this may well be the root cause for this bug, the symptoms would be
consistent.

I've tested suspending with dock attached quite extensively with a lenovo
onelink+ dock, and it would fail in similar ways: screen stays black. Switching
between these profiles (external and laptop panel) works reliably now.

These patches are in libkscreen master, I hope to get them into Plasma 5.7.4
(which is the next bugfix update).

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Nicolas Dietrich via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #30 from Nicolas Dietrich  ---
https://git.reviewboard.kde.org/r/125451/ has been merged, so we can look
forward to the next release!

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Dennis Brünig via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Matthias Blaicher via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #29 from Matthias Blaicher  ---
As a final data point, I've applied https://git.reviewboard.kde.org/r/125451/
on top of Plasma Desktop 5.6.4, and I have to say, this is godsend! No issues
anymore regarding removing screens, suspend in dock, docking, and all
combinations of it. Hell yeah!

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Matthias Blaicher via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

Matthias Blaicher  changed:

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 CC||matth...@blaicher.com

--- Comment #28 from Matthias Blaicher  ---
Given my huge issues with multi-monitors in general on multiple laptops. I've
decided to try reproducing other people's issues first. 

I am running Arch Linux with enabled testing repositories, which is
Qt: 5.6.0
Plasma Desktop: 5.6.4
KDE Applications: 16.04.1 
KScreen and LibKscreen are from git master (c949f3d, d80fede)
I have a intel Haswell card.

I've followed the steps described in the original post with an external VGA
monitor and could not reproduce the described state where all monitors are
disabled. 

However, the plasmashell  barely became active on the new monitor, with panels
missing and wrong background.  After some time (maybe after pressing Alt+F2),
the panels popped up again. 

Reattaching the monitor resulted In the expected beaviour, disabling the Laptop
monitor and only enabling the VGA screen. However, plasmashell behaved
strangely again: While the wallpaper was now right, the panels were in the
middle of the screen, probably at the positions from the old laptop screen.
This was followed by a plasmashell crash, involving Kscreen in some kind:

[KCrash Handler]
#5  0x7f894a69a7f0 in Plasma::Applet::actions() const () from
/usr/lib/libKF5Plasma.so.5
#6  0x00446303 in ?? ()
#7  0x0044647f in ?? ()
#8  0x7f894622b71c in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib/libQt5Core.so.5
#9  0x7f894b366d73 in
KScreen::Output::apply(QSharedPointer const&) () from
/usr/lib/libKF5Screen.so.7
#10 0x7f894b3480a4 in
KScreen::Config::apply(QSharedPointer const&) () from
/usr/lib/libKF5Screen.so.7
#11 0x7f894b354586 in
KScreen::ConfigMonitor::Private::updateConfigs(QSharedPointer
const&) () from /usr/lib/libKF5Screen.so.7
#12 0x7f894b356709 in
KScreen::ConfigMonitor::Private::edidReady(QDBusPendingCallWatcher*) () from
/usr/lib/libKF5Screen.so.7
#13 0x7f894622b71c in QMetaObject::activate(QObject*, int, int, void**) ()
from /usr/lib/libQt5Core.so.5
#14 0x7f894704167f in
QDBusPendingCallWatcher::finished(QDBusPendingCallWatcher*) () from
/usr/lib/libQt5DBus.so.5
#15 0x7f8947041778 in ?? () from /usr/lib/libQt5DBus.so.5
#16 0x7f894622c179 in QObject::event(QEvent*) () from
/usr/lib/libQt5Core.so.5
#17 0x7f89473b47bc in QApplicationPrivate::notify_helper(QObject*, QEvent*)
() from /usr/lib/libQt5Widgets.so.5
#18 0x7f89473b995f in QApplication::notify(QObject*, QEvent*) () from
/usr/lib/libQt5Widgets.so.5
#19 0x7f89461fe280 in QCoreApplication::notifyInternal2(QObject*, QEvent*)
() from /usr/lib/libQt5Core.so.5
#20 0x7f89462001fc in QCoreApplicationPrivate::sendPostedEvents(QObject*,
int, QThreadData*) () from /usr/lib/libQt5Core.so.5
#21 0x7f89462542c3 in ?? () from /usr/lib/libQt5Core.so.5
#22 0x7f8941db2dd7 in g_main_context_dispatch () from
/usr/lib/libglib-2.0.so.0
#23 0x7f8941db3040 in ?? () from /usr/lib/libglib-2.0.so.0
#24 0x7f8941db30ec in g_main_context_iteration () from
/usr/lib/libglib-2.0.so.0
#25 0x7f89462546cf in
QEventDispatcherGlib::processEvents(QFlags) ()
from /usr/lib/libQt5Core.so.5
#26 0x7f89461fc46a in
QEventLoop::exec(QFlags) () from
/usr/lib/libQt5Core.so.5
#27 0x7f8946204a0c in QCoreApplication::exec() () from
/usr/lib/libQt5Core.so.5
#28 0x0041c17c in ?? ()
#29 0x7f8945875741 in __libc_start_main () from /usr/lib/libc.so.6
#30 0x0041c2e9 in _start ()

Why does plasma anything to do with libkscreen?

In conclusion, maybe this is about the plasmashell not coming up again instead
of the monitor change not executed? At least #3 described seeing the mouse
cursor.

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Ben Tilford via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #27 from Ben Tilford  ---
This happens with every laptop I use. I'm unable to use any workaround like
xrandr because it doesn't even detect the laptop display.

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Ben Tilford via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Cruz Enrique via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Nick Cross via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #26 from Nick Cross  ---
I am seeing this in Fedora 23 with the latest QT 5.6 updates :-(

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Nicolas Dietrich via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

Nicolas Dietrich  changed:

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 CC||n...@mailbox.org

--- Comment #25 from Nicolas Dietrich  ---
> > PS : What is required to make this bug "Confirmed" ?
> 
> in the past we could vote! Now I can't find the option to, despite from
> being able to see my votes.

I think voting for disabled in the "kscreen" product. You can still manage
votes for other products (e.g. kdelibs).

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Briet via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

Briet  changed:

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Papoteur via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

Papoteur  changed:

   What|Removed |Added

 CC||yves.brungard_mageia@gadz.o
   ||rg

--- Comment #24 from Papoteur  ---
I think this bug is related to this one :
https://bugs.kde.org/show_bug.cgi?id=359602

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Aleix Pol via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

Aleix Pol  changed:

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[BW via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Diego F via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Adrian Piotrowicz via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Dmitry Nezhevenko via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Laven Pillay via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

Laven Pillay  changed:

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 CC||laven.pil...@darkness.co.za

--- Comment #18 from Laven Pillay  ---
I too have this problem regarding chaning from Dual Monitor to Single Monitor
and experiencing issues.
Details :
1. Laptop - Dell Latitude E5530
2. External monitor - Samsung SyncMaster S23B370 
3. When docked, and using Shared Desktop, with laptop on the Left and Monitor
on the Right, I use Monitor as Primary screen, with certain widgets and panels
4. When I undock, the Laptop does not become Primary again with all the
appropriate panels etc.

PS : What is required to make this bug "Confirmed" ?

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Paulo Fidalgo via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #19 from Paulo Fidalgo  ---
(In reply to Laven Pillay from comment #18)
> I too have this problem regarding chaning from Dual Monitor to Single
> Monitor and experiencing issues.
> Details :
> 1. Laptop - Dell Latitude E5530
> 2. External monitor - Samsung SyncMaster S23B370 
> 3. When docked, and using Shared Desktop, with laptop on the Left and
> Monitor on the Right, I use Monitor as Primary screen, with certain widgets
> and panels
> 4. When I undock, the Laptop does not become Primary again with all the
> appropriate panels etc.
> 
> PS : What is required to make this bug "Confirmed" ?

in the past we could vote! Now I can't find the option to, despite from being
able to see my votes.

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[KScreen] [Bug 351025] When external monitor is disconnected, the laptop monitor doesn't become active again

[Laven Pillay via KDE Bugzilla]

https://bugs.kde.org/show_bug.cgi?id=351025

--- Comment #21 from Laven Pillay  ---
UPDATE : 
Okay, the problem is not quite what I thought it was, and seems to be
inconsistent.

IMPORTANT : 
After some testing I see that my VGA cable connecting laptop to external is a
bit unstable and possibly damaged. On one attempt, it was connected but showed
up as a "VGA Monitor" instead of "Samsung Electric Company...". A
disconnect-reconnect detected the monitor correctly and showed up as
"Samsung...". So maybe similar things are happening to others ? Incorrect
detection of external monitor or something ?

Replicating original Problem : 
1. Log into Linux (Korora 23 KDE)
2. Connect external monitor 
3. Set External Monitor as Primary
4. Suspend/Shutdown laptop
5. Disconnect External Monitor
6. Restart laptop
7a. If laptop was Suspended - cannot log in due to keyboard not being detected
(cannot replicate futher)
7b. If laptop was Shut Down - Experience issue where laptop screen is not
primary

New Test Results :
1. Log into Linux (Korora 23 KDE)
2. Connect external monitor 
3. Set External Monitor as Primary
4. Disconnect External Monitor 
5. Laptop (correctly) switches to Laptop screen as Primary
6. Re-Connect External Monitor
7. Laptop+Screen correctly switches to External as Primary

So my current observations on my system are : 

1. If External Monitors are connected/disconnected while both laptop and
external are powered on, then everything seems to work fine - I see in Settings
that the Display setting switches the Primary monitor correctly.

2. If external monitors are connected/disconnected while powered down, possible
to have dual-monitor related issues.

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